Hair clipper



May 1l, 1937.

S. DEMOSKY ET AL HAIR CLIPPER Filed June 26, 1936v INVENTORS ATTORNEYS Patented May 11, 1937 UNITED STATES PATENT OFFICE HAIR CLIPPER Application June 26, 1936, Serial No. 81,540

4 Claims.

Our invention relates to improvements in hair clippers of the type characterized by a vibratory cutting blade.

Generally stated, the object of our invention is to devise a clipper of this type equipped with a drive for operating the vibratory blade at a higher speed and otherwise more eiiiciently than the drives of clippers as now constructed.

In its more specific aspect our invention is designed to provide an improved .drive for vibrating such a blade in a clipper comprising a driving arm vibrating within fixed limits and operating connections between said arm and blade for successively boosting the speed of movement of the blade relative to that of the driving arm.

Another object of our invention is to provide a drive of the character and for the purposes above set forth having the form of a leverage system electromagnetically operated.

20 To the accomplishment of the above, and

subordinate objects presently appearing, a preferred embodiment of our invention has been illustrated in the accompanying drawing and de- -scribed in detail and defined in the following ..5 description and claims respectively.

In said drawing:

Figure 1 is a View in horizontal section of a clipper equipped according to our invention.

Figure 2 is a view in longitudinal section taken on the line 2 2 of Figure l looking in the direction indicated by the arrows, and

Figure 3 is a view in perspective of a part of the driving arm and the operating 4connections between said arm and the vibratory cutting blade.

Referring to the drawing 'by numeral, the illustrated embodiment of our invention comprises a handle part having the form of a substantially tubular casing 2 including top and bottom walls 3 and 4 and side walls 5. The casing 2 is formed with a forwardly extending inclined socket 6 comprising a at base plate 1 and side walls 8 and open at its front end. The socket 6 supports a cutter head 9 seated therein and having the form of a casing opening into the casing 2 and comprising a bottom plate I0, supported on the base plate 1 and projecting forwardly of the same, a top plate II the front end of which curves downwardly and forwardly and projects beyond the base plate I0, and the side plates I2 secured to the side walls 5 of the casing 2 as by screws I3. The usual toothed comb like blade I4 is secured in fixed position to the underside of the projecting part of the bottom plate IIJ with its toothed edge I5 extending beyond the top plate I I and forming together with the latter a slot I6 in the lower front edge of the head 9. The blade I4 is secured in the described position by screws I1 passing therethrough and through the plates I `0 and II, a sleeve I8 on each screw interposed between the plates I0 and II and a wing nut I9 on each of said screws above the plate II. The usual vibratory toothed blade is mounted on top of the blade I4 for reciprocation thereon with its toothed edge l2I extending through the slot I6. The blade 20 is guided in its movement by mea-ns of slots 22 therein cooperating With guide lugs 23 .on the plate I4.

The driving means for the vibratory 'blade 20 comprises the following.

A driving arm 24 is pivotally vmounted intermediate its ends in the head 9 and on the bottom plate III by means of a stud 25. The driving arm 24 comprises a short ffront lever arm 26 in the head 9 4and a long rear lever arm 21 in the casing 2. The front portion of the driving arm 24 is curved into crank like form for pivoting at .one side of the horizontal center of the head 9 with the long and short arms 24 and 26 operating in said center and the short arm 26 obliquely disposed relative to the arm 21 all for a purpose presently seen. A blade operating crank 2B is pivotally mounted, as at 29, in the head 3 on the bottom plate VIIJ and in the longitudinal center of the head. The ybladeoperating crank 28 comprises a long `lever arm 30 having a loose connection 3I with the blade 2D and a short lever arm 3,2 extending toward the pivot l25 of the driving arm 24.

The short arm 26 of the driving arm 24 and the short lever arm 32 of the blade operating crank 28 are oi toothed segmental form and are operatively connected by two similar pairs of superposecl stepped vlever arms 33 and 34, respectively, of toothed segmental form in each instance. Each vpair of arms 33 and 34 comprises short arms and 35 of the same length as the arm 32 and long arms 36 and 36 of the same length as the arm 26 of the driving lever 24. The arms 35 and 36 of the pair of levers 33 are fixed in aligned relation whereas the arms 35 and 36 of the other pair 34 are angularly related for a purpose presently apparent. The aligned pair of lever arms 33 is pivotally mounted, as at 31. on the bottom plate IIJ at the side of the head 9 opposite to that at which the driving arm 24 is pivoted for alignment with the short arm 26 of said driving arm and with the short arm 35 of said pair meshing with said short arm 26. 'I'he angularly related pair of lever arms 34 is pivoted on the pivot of the driving arm 24, beneath the latter, the angular relation of such arms being such that the long arm meshes with the arm 32 and the short arm 35 meshes with the long arm 35 of the aligned pair of levers 33.

The driving arm 24 is normally held yieldingly in an intermediate position with its long arm 21 in the center of the casing 2 and by means of a pair of opposed cushion springs 38 interposed between opposite side walls 5 of the casing 2 and said arm, respectively, with their ends suitably mounted on lugs 39 on said walls and arms. The driving arm is preferably vibrated, against the tension of said springs, by means of a pair of electromagnets 43 disposed upon opposite sides of the long arm 27 of said lever. Each electromagnet 40 is mounted in a tubular housing 4I itted into the rear end of the casing 2 and secured therein by a thumb screw 42 threaded through one side wall 5 and said housing 4l. The rear end of the casing 2 is closed by a removable cap member' 43. The leads 44 to the electromagnets 4G extend through the cap meniber 43 for connection to the house circuit in the usual manner. A suitable control switch 45 is mounted on the cap member 43. A ringer grip 43 is secured to one side wall 5 of the casing 2.

In the operation of our invention the driving arm 24 vibrates within iixed limits as determined by the cores 41 of the electromagnets 40. The ratio oi movement of the operating arms 32 is increased, or boosted, relative to that of the short driving arm 2G by the described difference in leverage between said short arm 2S and the short arm 35 of the pair 33, and is again increased by the described difference in leverage between the pairs of levers 33 and 34 and still further increased by the difference in leverage described between the pair of arms 34 and said operating arm.

Thus as will be clear with a driving arm vibrating within fixed limits and at a iixed speed a vibratory blade operating arm is operated at a speed ratio relative to the driving arm boosted successively so that a very high speed of operation of the cutting blade may be obtained with a low speed operating arm.

The described aligned and angular relation oi the lever arms of the pairs 33 and 34 together with the curved end of the driving arm 24 provides for pivotal mounting of the different lever arms in compact arrangement in the head 9 for movement in parallel planes without interference.

The foregoing detailed description will, it is believed, suffice to impart a clear understanding of the construction and operation of our invention.

It is to be understood, however, that the de tails described are illustrative of a preferred embodiment of our invention only and that right is herein reserved to modifications of details described falling within the scope of the claims appended hereto.

What we claim is:

1. In a hair clipper, the combination with a vibratory cutting blade, of a crank having a loose connection with said blade, a driving arm comprising a short and a long arm, a short lever having an operating connection with said short arm, a long lever connected to said short lever, a second short lever operatively connected to said long lever, a second long lever connected to said second short lever and having an operative connection with said crank, and means for actuating said driving arm.

2. In a hair clipper, the combination with a vibratory cutting blade, of a vibratory blade operating member, a driving member, and operating connections between said members comprising a pair of long and short levers connected together and one operated by said driving member, a second pair of long and short levers connected together, one of the levers of the iirst pair arm, a long lever connected to said short lever, a '1" second short lever operatively connected to said long lever, a second long lever connected to said second short lever and having an operative connection with said crank, and means for actuating said driving arm, the diiierence in leverage between tne short arm and the various levers being such as to effect three progressive increases of the ratio of movement of the crank with respect to that of the short driving arm.

4. In a hair clipper, the combination with a v vibratory cutting blade, of a vibratory blade operating member, a driving member having long and short lever arms, and operating connections between said members comprising a pair of long and short parallel levers connected together and one operated by said short arm, a second pair of long and short levers connected together in angular relation, the other lever of the rst mentioned pair being operatively connected to a lever of the second mentioned pair, and the other lever of the second mentioned pair being operatively connected to the vibratory blade operating member.

STEPHEN DEMOSKY.

JOSEPH A. CICHANSKI.

Llll 

